Shaft seal



July 16, 1929. H. H. NEsBrrT 1.SHAFT SEAL Filed July so, 192e Patented July 16, 1929.

UNITED STATES 1,120,920 PATENT OFFICE'.

HAROLD HANESBITT, or BELAIR, MARYLAND.

SHAFT sri-AI..-

Application filed July 30,

' the driving end of the crank shaft and'located so as to receive a continuous bath of oil which is in the crank case. rlhe shaft seal as commonly arranged on the crank shaft is located on the outside of the casing cap thereby receiving only a limited and insufficient lubrication. i

A further object of this invention is to provide a suitable lubricating means for lubricating the crank shaft.

Another object of this invention is to provide a bellows type shaft seal which may be easily arranged on the driving end of the i crank shaft thereby making it possible to more closely assemble the apparatus, partielllarly in respect to the location of the fly wheel fan on the crank shaft which may, by means of this invention, be brought in close' contact with the bearing cap, thereby bringing it into more eiiicient working with the compressor.

A further object of this invention is to provide a shaft seal which will materially decrease the pressure area of the seal.

Further details of this invention will appear from the following detailed description and from the disclosure of the single sheet of the drawings which is herewith made a part of this application.

In the drawings,

Fig. 1 illustrates a vertical sectional View of the compressor showing the improved shaft seal in proper relationship thereto.

Fig. 2 is a side view of a portion of theA shaft sealing means including the bellows and sealing rings connected thereto.

Fig. 3 illustrates an end view ofthe shaft sealing means'disclosed in Fig. 2.

Numeral 1 designates the main housing for .compressor or refrigerating apparatus which includes a cylinder portion 2 having slidably positioned therein a piston 3 and a crank case portion 4 adapted to have therein an oil bath in the usual manner. The upper portion 4of the cylinder is adapted to have attached thereto the usual elements such 'as a cylinder head portion 5. The opposite end of the housing 1 is suitably connected to a base element 6 by 1926. Serial No. 126,062.

means of machine bolts 7 or otherwise. The piston 3 is connected in the usual manner by means of a connecting rod 8 to a crank 9 and shaft 10. A crank case cap 11 is adapted to be suitably connected to the housing 1 by means of machine bolts 12, and between the inner surface of the cap 11 and the crank element, a shaft seal is properly positioned, the

shaft seal to consist of a bellows 13 preferably made of flexible metal or any other suitable material. The bellows is hermetieally sealed Y at the ends thereof to sealing' rings 14 and 15. The sealing ring 14 being adapted to be positioned within'a depression on the inner surface of the casing cap 11, while the sealing ring 15`is adapted to be' suitably placed on the crank shaft in proximity to the crank portion in such a manner as to completely seal the space between the crank shaft and the flexible metal bel-lows 13 which is located circumferentially vofthe crank shaft.- In order to assure a complete seal, elements 16 are positioned between-the sealing ring 141 and the crank easing cap 11. 1n order to insure constant sealing effect, atension spring 17 is cireumferenti'ally positioned around-the crank shaft 10 and within the bellows 13 in such a manner as to give suficient tension to maintain the sealing ring 15 in constant pressure against the crank portion 9.

A housing 18 for the sealing means is adapted to be attached tothe inner surface of the crank case cap 11 by machine screws 19 or otherwise.` The housing element 18 will function as a protection to the metal flexible bellows 13, as well as a general guiding element for the crank 9.in its rotation. A shaft seal :1s-'ordinarily located in refrigerating compressors is placed on the driving end of the 'crank shaft outside of the crank casing cap thereby forcing important elements of the compressor to be positioned at an uneconomical dist-ance from the cylinder portion. A shaft seal located in theusual manner is diilicult to maintain in a proper lubricated condition. The shaft seal, according to this invention is located on the crank or eccentric end of the crank shaft within the crank cas- A ceeiom el? ishe'eeeok shaft eis @his peine, e iibii Seeing opening 2i being piovided oecimiiting @ii to ehe This imvemioo provides e she seei which may be easiiy eppiiedi to @he omnia Sheik im snob. e mamme? es to eiimimee much of eine mfom of melchimimg and ieoer mec esser? im* the imseeiieiom of ehe common eiie) seal.,

.may oe medie Withim utile scope of his eppiice- 35 e creek cese eonmiiiiog eiis e creek shaft, e

meeeeo removable cap for the creek cese *hmgiiV which ehe creek shaft is adapted to extend, e seei positioned on the shaf, Within the amok cese adjacent the inner surface of ehe oep in such e menne? es fno eceive e, constant bath of oil fiom the creek case, means .for assuring e compie@ seal consisting or sealing Ting elements eouneeisunk in the inner. sui-fece of ie removebie oep, o qhousing detechably cemiiected to she inner surface of ehe cap foi pic@ eceing ich@ seal, be housing having am olsen ende@ portion or edmiiting eil from the L crank cese to ehe seei.

in testimony whereof E affix my signetuie.

HARMD H. NESBTT., 

